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Fair Value Accounting (Details 1) - Fair Value on a Nonrecurring Basis [Member] - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Assets |  |
Impaired loans | $ 9,730 | $ 8,769
Other real estate owned | 117 | 242
Total assets measured at fair value on a nonrecurring basis | 9,847 | 9,011
Level 1 [Member] |  |
Assets |  |
Impaired loans |  |
Other real estate owned |  |
Total assets measured at fair value on a nonrecurring basis |  |
Level 2 [Member] |  |
Assets |  |
Impaired loans | 1,391 | 2,685
Other real estate owned | 23 | 148
Total assets measured at fair value on a nonrecurring basis | 1,414 | 2,833
Level 3 [Member] |  |
Assets |  |
Impaired loans | 8,339 | 6,084
Other real estate owned | 94 | 94
Total assets measured at fair value on a nonrecurring basis | $ 8,433 | $ 6,178

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
Name: | sfst_AssetsFairValueDisclosuresNonRecurring
Namespace Prefix: | sfst_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Impaired loans, Fair value. + References No definition available. + Details
Name: | sfst_ImpairedLoansFairValue
Namespace Prefix: | sfst_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Other real estate owned. + References No definition available. + Details
Name: | sfst_OtherRealEstateOwned
Namespace Prefix: | sfst_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_AssetsFairValueDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsNonrecurringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |